A flaring precision forming die for metal bushing workpieces

Abstract

The utility model discloses a kind of flaring precision forming die for metal shaft sleeve class workpiece, it is related to forming die technical field, solve the problem of material crack and the problem of unreliable compression in the shaft sleeve class part stamping forming in prior art, the utility model includes die body and fixed female seat, positioning punch is equipped on the die body, fixed female seat is equipped with the positioning groove for bearing shaft sleeve workpiece lower end and with the positioning punch corresponding, annular limit groove corresponding with the root of positioning punch is equipped on the die body, the annular limit groove is used for and the deformation part on the upper end of shaft sleeve workpiece cooperation and makes deformation part produce deformation, and the volume of annular limit groove is less than or equal to the volume of deformation part. By setting the volume of annular limit groove less than or equal to the volume of deformation part on the upper end of shaft sleeve workpiece, it can be ensured that when extruding deformation is carried out to the upper end of shaft sleeve workpiece, it can be filled in annular limit groove sufficiently, effectively avoid the cracking defect caused by material state difference.

Description

Technical Field

[0001] This utility model relates to the field of forming die technology, and in particular to a flaring precision forming die for metal bushing-type workpieces. Background Technology

[0002] The connecting piece is a crucial power supply adapter component connecting the electromagnet coil and the power source. The reliability of the connecting piece directly affects the reliability of the matching solenoid valve. The connection between the connecting piece and the brass bushing is achieved using a die structure, with direct stamping and flaring. This process can easily lead to quality issues such as cracks in the brass bushing. The pass rate of brass bushings from different batches is uncontrollable, and there have been instances of entire batches being scrapped. The product quality risk is uncontrollable and seriously affects the normal delivery of the product.

[0003] Existing die structures, such as the Chinese invention patent with publication number CN119035388A, disclose a copper alloy tubular rivet forming fixture and its forming method. The forming fixture includes a tailstock, a protective sleeve, and a forming body. The protective sleeve is installed inside the tailstock, and the forming body is inserted into the protective sleeve. The processing method includes the following steps: blanking, flaring the inner hole of the blank, and flanging to form the head of the part.

[0004] In this design, the groove on the molded body that mates with the workpiece is an arc-shaped groove, intended to guide the workpiece as it expands outwards. However, in actual use, bushing-type parts are often formed by directly cold-pressing the ends outwards, which can easily lead to material cracks and unreliable clamping, resulting in uncontrollable scrap rates. Therefore, designing a precision flaring die to ensure that the connection and clamping of metal bushing-type workpieces with the electromagnet terminal block meets design requirements, and to guarantee quality stability and yield rate, is of significant practical importance. Utility Model Content

[0005] To address the shortcomings in the aforementioned background technology, this utility model proposes a flaring precision forming die for metal bushing-type workpieces, which solves the problems of material cracking and unreliable clamping in the stamping and forming of bushing-type parts in the prior art.

[0006] The technical solution of this utility model is implemented as follows: a precision forming die for flaring metal bushing workpieces includes a die body and a fixed base. The die body is provided with a positioning punch, and the fixed base is provided with a positioning groove for supporting the lower end of the bushing workpiece and corresponding to the positioning punch. The die body is provided with an annular limiting groove corresponding to the root of the positioning punch. The annular limiting groove is used to cooperate with the part to be deformed at the upper end of the bushing workpiece and cause the part to be deformed to deform. The volume of the annular limiting groove is less than or equal to the volume of the part to be deformed.

[0007] Preferably, the outer wall of the positioning punch has a taper. The taper range is 5° to 10°, which facilitates uniform diameter expansion of the bushing workpiece while achieving the positioning purpose, thereby reducing stress concentration.

[0008] Preferably, the bushing workpiece has an inner hole that mates with the positioning punch. The diameter of the inner hole is smaller than the outer diameter of the top end of the positioning punch. The outer diameter of the annular limiting groove is larger than the outer diameter of the upper end of the bushing workpiece. The distance between the inner end face of the annular limiting groove and the lower end face of the positioning punch is smaller than the length of the bushing workpiece.

[0009] Preferably, the inner annular surface of the annular limiting groove and the outer wall of the positioning punch are on the same conical surface. The cross-section of the annular limiting groove is a right-angled trapezoid, which allows the material of the deformable part of the bushing workpiece to deform synchronously and coordinately during radial expansion and axial compression, improving the consistency of forming.

[0010] Preferably, the positioning punch is welded to or integrally formed with the die body. The bushing workpiece is snapped, bonded, or fused onto the positioning groove.

[0011] The beneficial effects of this utility model are as follows: By setting a positioning punch and a positioning groove to work together, the positioning and fixing of the bushing workpiece are achieved, ensuring uniform force on the bushing during the stamping process; by setting an annular limiting groove that cooperates with the positioning punch, precise control of the deformation direction and amount during the flaring process of the bushing workpiece is achieved. By setting an annular limiting groove with a volume less than or equal to the volume of the upper part to be deformed of the bushing workpiece, it is ensured that when the upper part of the bushing workpiece is extruded and deformed, the part to be deformed can deform and fully fill the annular limiting groove, effectively avoiding cracking defects caused by differences in material state. Furthermore, by limiting the size of the annular limiting groove, its axial and radial deformation can be quantitatively constrained when it cooperates with the part to be deformed, making the flaring extension deformation sufficient and consistent, significantly improving the consistency and reliability of the product. Compared with traditional stamping dies, this utility model eliminates the risk of scrapping the entire batch, greatly reducing the scrap rate and production costs. At the same time, the die structure is simple and the positioning is accurate, suitable for small-batch, multi-variety production needs, ensuring stable product quality and improving delivery capabilities. Attached Figure Description

[0012] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a cross-sectional structural diagram of the punch die body of this utility model; Figure 2 This is a schematic diagram of the punching die structure of this utility model; In the figure: 1: Die body, 2: Fixed female seat, 3: Positioning punch, 4: Bushing workpiece, 5: Positioning groove, 6: Annular limiting groove, 7: Connecting piece, 8: Part to be deformed. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figure 1 , 2 As shown in Embodiment 1, a precision forming die for flaring out metal bushing workpieces includes a die body 1 and a fixed base 2. The die body 1 is provided with a positioning punch 3, and the fixed base 2 is provided with a positioning groove 5 for supporting the lower end of the bushing workpiece 4 and corresponding to the positioning punch 3. The positioning groove 5 is coaxially corresponding to the positioning punch 3, thereby achieving precise positioning of the bushing workpiece 4.

[0016] On the die body 1, an annular limiting groove 6 is provided around the root of the positioning punch 3. It cooperates with the deformable part 8 at the upper end of the bushing workpiece 4 to guide and constrain the material deformation during the stamping process. The volume of the annular limiting groove 6 is less than or equal to the volume of the deformable part 8 at the upper end of the bushing workpiece 4, ensuring that the material of the deformable part 8 fully fills the cavity of the annular limiting groove 6 during the extrusion deformation process, avoiding wrinkling or local cracking due to material accumulation, thereby achieving controllable elongation and stable forming.

[0017] As a further specific embodiment, the outer wall of the positioning punch 3 has a taper. In this embodiment, the taper of the outer wall of the positioning punch 3 is in the range of 5° to 10°, which facilitates the uniform expansion of the bushing workpiece 4 while achieving the positioning purpose, thereby reducing stress concentration. The bushing workpiece 4 is provided with an inner hole that mates with the positioning punch 3. The diameter of the inner hole of the bushing workpiece 4 is slightly smaller than the outer diameter of the top of the positioning punch 3, forming an interference fit to ensure initial positioning accuracy and stamping stability.

[0018] Furthermore, the distance between the inner end face of the annular limiting groove 6 and the lower end face of the positioning punch 3 is less than the length of the bushing workpiece 4. By limiting the depth dimension of the annular limiting groove 6, the maximum axial deformation of the bushing is determined, ensuring that the part to be deformed at the upper end of the bushing workpiece 4 can be compressed and undergo plastic flanging deformation during stamping, thereby achieving effective expansion and compression of the connecting piece. The outer diameter of the annular limiting groove 6 is larger than the outer diameter of the upper end of the bushing workpiece 4, providing space for the radial expansion of the part to be deformed, while limiting the radial deformation range, thereby using this part to be deformed to effectively compress the connecting piece and prevent loosening.

[0019] In this embodiment, the inner ring surface of the annular limiting groove 6 and the outer wall of the positioning punch 3 are on the same conical surface, so that the material of the part to be deformed of the bushing workpiece 4 deforms synchronously and in a coordinated manner during radial expansion and axial compression, thereby improving the consistency of forming. The cross-section of the annular limiting groove 6 is a right trapezoid, which is beneficial for controlling the material flow direction and enhancing the structural strength.

[0020] In Example 2, based on Example 1, the positioning punch 3 is welded to or integrally formed with the die body 1. The bushing workpiece 4 is snapped, bonded, or fused onto the positioning groove 5.

[0021] In this embodiment, in the scenario where a terminal block and a brass bushing are used, the brass bushing serves as the bushing workpiece 4, and the terminal block serves as the fixed female seat 2. First, the brass bushing is set on the positioning groove 5 of the terminal block by snap-fitting, bonding, or welding. Alternatively, the terminal block can be directly formed at one end of the brass bushing using injection molding and hot pressing. The location of the brass bushing is the positioning groove. Then, the die body and the terminal block are respectively clamped on the impact end and the bearing seat of the punch press. At the same time, the positioning punch at the end of the die body is aligned with the inner hole of the brass bushing, and the connecting piece 7 for wiring is sleeved on the brass bushing. The part to be deformed 8 of the bushing workpiece is the part of the upper end of the brass bushing that protrudes above the connecting piece. Then, the punch press is turned on for impact. The positioning punch flares the brass bushing and deforms after the deformable end of the upper end of the brass bushing enters the annular limiting groove, filling the annular limiting groove. At the same time, the deformation presses the connecting piece sleeved on the brass bushing onto the terminal block. This die allows for precise quantitative control of the deformation direction and amount of brass bushings, significantly solving the problems of cracking and unreliable pressing during the stamping process. In continuous production, it achieves precise and consistent deformation of brass bushings, improving product quality consistency and production efficiency.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A precision forming die for flaring metal bushing-type workpieces, characterized in that: The die includes a die body (1) and a fixed base (2). The die body (1) is provided with a positioning punch (3). The fixed base (2) is provided with a positioning groove (5) for supporting the lower end of the bushing workpiece (4) and corresponding to the positioning punch (3). The die body (1) is provided with an annular limiting groove (6) corresponding to the root of the positioning punch (3). The annular limiting groove (6) is used to cooperate with the deformable part (8) at the upper end of the bushing workpiece (4) and cause the deformable part (8) to deform. The volume of the annular limiting groove (6) is less than or equal to the volume of the deformable part (8).

2. The flaring precision forming die for metal bushing-type workpieces according to claim 1, characterized in that: The outer wall of the positioning punch (3) is tapered.

3. The flaring precision forming die for metal bushing-type workpieces according to claim 2, characterized in that: The taper range is 5° to 10°.

4. The flaring precision forming die for metal bushing-type workpieces according to claim 3, characterized in that: The bushing workpiece (4) has an inner hole that mates with the positioning punch (3), and the diameter of the inner hole is smaller than the outer diameter of the top end of the positioning punch (3).

5. The flaring precision forming die for metal bushing-type workpieces according to claim 4, characterized in that: The outer diameter of the annular limiting groove (6) is greater than the outer diameter of the upper end of the bushing workpiece (4), and the distance between the inner end face of the annular limiting groove (6) and the lower end face of the positioning punch (3) is less than the length of the bushing workpiece (4).

6. The flaring precision forming die for metal bushing-type workpieces according to claim 5, characterized in that: The inner ring surface of the annular limiting groove (6) and the outer wall of the positioning punch (3) are on the same conical surface.

7. The flaring precision forming die for metal bushing-type workpieces according to claim 6, characterized in that: The cross-section of the annular limiting groove (6) is a right trapezoid.

8. The flaring precision forming die for metal bushing-type workpieces according to any one of claims 1 to 7, characterized in that: The positioning punch (3) is welded to or integrally formed with the die body (1).

9. The flaring precision forming die for metal bushing-type workpieces according to claim 8, characterized in that: The bushing workpiece (4) is snapped, bonded or fused onto the positioning groove (5).

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